| T31 | Burns classified according to extent of body surface involved | NON-BILLABLE CODE |
| T31.0 | Burns involving less than 10% of body surface | BILLABLE CODE |
| T31.1 | Burns involving 10-19% of body surface | NON-BILLABLE CODE |
| T31.10 | Burns involving 10-19% of body surface with 0% to 9% third degree burns | BILLABLE CODE |
| T31.11 | Burns involving 10-19% of body surface with 10-19% third degree burns | BILLABLE CODE |
| T31.2 | Burns involving 20-29% of body surface | NON-BILLABLE CODE |
| T31.20 | Burns involving 20-29% of body surface with 0% to 9% third degree burns | BILLABLE CODE |
| T31.21 | Burns involving 20-29% of body surface with 10-19% third degree burns | BILLABLE CODE |
| T31.22 | Burns involving 20-29% of body surface with 20-29% third degree burns | BILLABLE CODE |
| T31.3 | Burns involving 30-39% of body surface | NON-BILLABLE CODE |
| T31.30 | Burns involving 30-39% of body surface with 0% to 9% third degree burns | BILLABLE CODE |
| T31.31 | Burns involving 30-39% of body surface with 10-19% third degree burns | BILLABLE CODE |
| T31.32 | Burns involving 30-39% of body surface with 20-29% third degree burns | BILLABLE CODE |
| T31.33 | Burns involving 30-39% of body surface with 30-39% third degree burns | BILLABLE CODE |
| T31.4 | Burns involving 40-49% of body surface | NON-BILLABLE CODE |
| T31.40 | Burns involving 40-49% of body surface with 0% to 9% third degree burns | BILLABLE CODE |
| T31.41 | Burns involving 40-49% of body surface with 10-19% third degree burns | BILLABLE CODE |
| T31.42 | Burns involving 40-49% of body surface with 20-29% third degree burns | BILLABLE CODE |
| T31.43 | Burns involving 40-49% of body surface with 30-39% third degree burns | BILLABLE CODE |
| T31.44 | Burns involving 40-49% of body surface with 40-49% third degree burns | BILLABLE CODE |
| T31.5 | Burns involving 50-59% of body surface | NON-BILLABLE CODE |
| T31.50 | Burns involving 50-59% of body surface with 0% to 9% third degree burns | BILLABLE CODE |
| T31.51 | Burns involving 50-59% of body surface with 10-19% third degree burns | BILLABLE CODE |
| T31.52 | Burns involving 50-59% of body surface with 20-29% third degree burns | BILLABLE CODE |
| T31.53 | Burns involving 50-59% of body surface with 30-39% third degree burns | BILLABLE CODE |
| T31.54 | Burns involving 50-59% of body surface with 40-49% third degree burns | BILLABLE CODE |
| T31.55 | Burns involving 50-59% of body surface with 50-59% third degree burns | BILLABLE CODE |
| T31.6 | Burns involving 60-69% of body surface | NON-BILLABLE CODE |
| T31.60 | Burns involving 60-69% of body surface with 0% to 9% third degree burns | BILLABLE CODE |
| T31.61 | Burns involving 60-69% of body surface with 10-19% third degree burns | BILLABLE CODE |
| T31.62 | Burns involving 60-69% of body surface with 20-29% third degree burns | BILLABLE CODE |
| T31.63 | Burns involving 60-69% of body surface with 30-39% third degree burns | BILLABLE CODE |
| T31.64 | Burns involving 60-69% of body surface with 40-49% third degree burns | BILLABLE CODE |
| T31.65 | Burns involving 60-69% of body surface with 50-59% third degree burns | BILLABLE CODE |
| T31.66 | Burns involving 60-69% of body surface with 60-69% third degree burns | BILLABLE CODE |
| T31.7 | Burns involving 70-79% of body surface | NON-BILLABLE CODE |
| T31.70 | Burns involving 70-79% of body surface with 0% to 9% third degree burns | BILLABLE CODE |
| T31.71 | Burns involving 70-79% of body surface with 10-19% third degree burns | BILLABLE CODE |
| T31.72 | Burns involving 70-79% of body surface with 20-29% third degree burns | BILLABLE CODE |
| T31.73 | Burns involving 70-79% of body surface with 30-39% third degree burns | BILLABLE CODE |
| T31.74 | Burns involving 70-79% of body surface with 40-49% third degree burns | BILLABLE CODE |
| T31.75 | Burns involving 70-79% of body surface with 50-59% third degree burns | BILLABLE CODE |
| T31.77 | Burns involving 70-79% of body surface with 70-79% third degree burns | BILLABLE CODE |
| T31.8 | Burns involving 80-89% of body surface | NON-BILLABLE CODE |
| T31.80 | Burns involving 80-89% of body surface with 0% to 9% third degree burns | BILLABLE CODE |
| T31.81 | Burns involving 80-89% of body surface with 10-19% third degree burns | BILLABLE CODE |
| T31.82 | Burns involving 80-89% of body surface with 20-29% third degree burns | BILLABLE CODE |
| T31.83 | Burns involving 80-89% of body surface with 30-39% third degree burns | BILLABLE CODE |
| T31.84 | Burns involving 80-89% of body surface with 40-49% third degree burns | BILLABLE CODE |
| T31.85 | Burns involving 80-89% of body surface with 50-59% third degree burns | BILLABLE CODE |
| T31.86 | Burns involving 80-89% of body surface with 60-69% third degree burns | BILLABLE CODE |
| T31.87 | Burns involving 80-89% of body surface with 70-79% third degree burns | BILLABLE CODE |
| T31.88 | Burns involving 80-89% of body surface with 80-89% third degree burns | BILLABLE CODE |
| T31.9 | Burns involving 90% or more of body surface | NON-BILLABLE CODE |
| T31.90 | Burns involving 90% or more of body surface with 0% to 9% third degree burns | BILLABLE CODE |
| T31.91 | Burns involving 90% or more of body surface with 10-19% third degree burns | BILLABLE CODE |
| T31.92 | Burns involving 90% or more of body surface with 20-29% third degree burns | BILLABLE CODE |
| T31.93 | Burns involving 90% or more of body surface with 30-39% third degree burns | BILLABLE CODE |
| T31.94 | Burns involving 90% or more of body surface with 40-49% third degree burns | BILLABLE CODE |
| T31.95 | Burns involving 90% or more of body surface with 50-59% third degree burns | BILLABLE CODE |
| T31.96 | Burns involving 90% or more of body surface with 60-69% third degree burns | BILLABLE CODE |
| T31.97 | Burns involving 90% or more of body surface with 70-79% third degree burns | BILLABLE CODE |
| T31.98 | Burns involving 90% or more of body surface with 80-89% third degree burns | BILLABLE CODE |
| T31.99 | Burns involving 90% or more of body surface with 90% or more third degree burns | BILLABLE CODE |
